Plunger-elevator.



PATBNTED 00T..1s, 1904.

F. A. JONES. PLUNGER llIEVA'lOl. APPLIOATION FILED SEPT. 12. 190s.

N0 MODEL.

(g1/wanten @tro/ane@ Y @witnesses UNITED STATES Patented October 18', 1904.

PATENT OEEICE.

FRED A. JONES, OF VVOROESTER, MASSACHUSETTS, ASSIGNOR OF.TVO THIRDS TO WILLIAM E. D. STOKES, OF NEW YORK, N. Y., AND THURE LARSSON, OF VVOROESTER, MASSACHUSETTS. v

PLUNGER-ELEVATOR.

SPECIFICATION forming part of Letters Patent N0. 772,361, dated October 18, 1904.

Application filed September l2, 1908. Serial No. 172,995. (No model.) l

T0 a/Z whom, t may concern;

Be it known that I, FRED A. J oNEs, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Plunger-Elevators, of which the following is a full, clear, and exact specification.

This invention relates to plunger-elevators, and has particular reference to means for the prevention of accidents by the accidental breaking of the plunger or its separation from the car. y

In hydraulic elevators the combined weight of the car and plunger generally exceeds that of the counterweight, but the latter exceeds in weight that of the car alone. Should the plunger break or become detached from the car, there would be nothing to balance theY counterweight and it would pull the car to the top of the shaft without any means of control. There is always a possibility that such an accident will happen, because the varying loads and strains on the plunger tend to weaken theA joints and fastenings. A structural Weakness or a defect in the fastening cannot be easily discovered even by careful inspection, and it is therefore important to provide means for preventing the car from being overcome by the counterweight if there should happen to be any defects in the plungeror its fastenings. With this object in View I propose to provide means for preventing the plunger from separating from the car in case ofabreak between the ends of the plunger or where it is attached to the car. l

The invention will be more fully described in connection with the accompanying drawings,.in which- Figure 1 is a vertical section of an elevator embodying one form of my invention. Fig.

2 is an enlarged detail showing the manner of attachment of the cable to its supports, and Fig. 3 is a detail plan view of the same.

1 represents the main cylinder, in which the plunger 2 reciprocates 3 is the inlet and exhaust port of the main cylinder, leading to a suitable 'main valve and source of power-supply.

Mounted on the plunger 2 is a car 4:, to the top of which is attached the usual cable 5, running over a sheave 6 and carrying the counterweight 7. The frame of the car is secured to two I-beams 8 8. Suitably attached to the beams 8 8 is a plate 9, which carries the .usual threaded socket-plate 10, into which the upper end of the plunger is screwed. It can be seen that if for any reason the socket-plate or the plunger should break there would be no connection between the broken portion and the car. By the construction to be described there will always be such a connection and the plunger will in addition be strengthened, so that breaks will be less likely to occur.

11 11 are transverse angle-plates which are secured to the beams 8.

14 is a rod, cable, chain, or similar device which is suitably secured to the lower end of the plunger and to a threaded eyebolt or rod 15, passingbetween the plates 11 and carrying a nut 17.

16 is a washer on which the nut bears. By tightening up the nut 17 the cable 14: may be tightened as much as desired. In addition to preventing the plunger from becoming separated from the car the taut cable serves to put the plunger under continuous stressin one direction, giving it additional strength and keeping the joints tight. This latter feature is of advantage, because when the water gets into the plunger its buoyancy is lessened and the efliciency of the elevator reduced.

It will of course be understood that the cable need not necessarily be attached to the lower end of the plunger, it being only essential that the combined weight of the portion of the plunger above the joint of attachment and the car be approximately equal to that of the counterweight. Where the word cable is used in this specification I do not thereby preclude myself from the use of equivalent devices, such as a chain or rod. In some cases a rod might be preferable on account of its greater stiffness.

Modifications and changesv may be made without departing from the scope of the invention.

Having thus described my invention, I declare that what I claim as new, and desire to secure by Letters Patent, is

l. In a hydraulic elevator, the combination of a oar mounted on separated cross-beams, a

socket-plate secured to said cross-beams, a depending plunger carried by said socket-plate, transverse beams supported by said first-mentioned beams, and a cable attached to said plunger and t0 a rod carried by said transverse beams, substantially as described.

2. In a hydraulic elevator, the combination 

